Just make sure your video actually has something to do with the article in question or you'll find your videos deleted by mods.

You might also want to keep tabs on these articles, because competitors like to delete links from wikia sites. Yes, there is an unfortunate dark side to wikias. This is the #1 reason why I made my own wiki game database website, RPG Fanatics. We don't allow regular users to delete user submissions and encourage everyone to share their videos.

Anyway, when submitting to the wikia feed app, keep in mind the videos tend to be organized by their titles alphabetically. You should also try to make the title something that will be at the top of the page.

Embedding videos is a great
way to get views BUT can also
attracted unwanted attention from
wiki editors who delete competitor links.

Lastly you can also attempt to embed your videos into wiki articles, though this can often attract the attention of competitors who want to delete your videos and insert their own, or simply delete any videos or links added to an article they have links at. This can be hit and miss, and getting involved in edit wars is something you should try to avoid because it nearly always ends poorly.

After submitting your video into a page you should then share the link on social bookmarking sites like Stumbleupon and Reddit. This will help them gain visibility. Sure, other people's videos are on these pages too but if your video has an attractive enough thumbnail and title you can stand out of the crowd!